Abstract: A token ring local area network concentrator which permits computers and other types of data terminal equipment to communicate with each other. The concentrator has several ports for connecting to the data terminal equipment and to other concentrators, with each port for connecting to the data terminal equipment having associated circuitry for regenerating and retiming data in the ring so as to reduce amplitude and phase distortion such as phase jitter. The associated circuitry includes a passive L/C tank circuit which is excited by the received data and which rings or resonates at a frequency which is preferably an integral multiple of the frequency or bit rate of the received data. The tank circuit functions to remove much of the phase jitter from the received data, thereby permitting a large number of data terminal equipment to be added to the ring and permitting longer lobe cable lengths, with lobe cables functioning to connect the data terminal equipment to the concentrator.